verbs - want + object + to-infinitive / v-ing. Subject + want + v-ing

I'm a bit hesitant when using these sentences :

1. I don't want you talking about her.




2. I don't want you to talk about her.




3. This wall wants painting.





4. The students want teaching.

As we know the verb want is followed by an object and then followed by the to-infinitive, as in the sentence number #2. But I found that the sentence number #1 is also used.

Is the sentence number #1 acceptable to use ?
Or should I use the form number #2 instead ?

As to the sentence number #3 and #4,

Does the sentence #3 have the passive meaning ?

Is the sentence #4 correct ? because I use people as the subject instead of things.